prof. Ing. Martin Hartl, Ph.D. |
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Education and academic qualification
- 1990, MSc, Faculty of Mechanical Engineering, Technical University of Brno, Design of Production Machines and Equipment.
- 1997, PhD, Faculty of Mechanical Engineering, Technical University of Brno, Design and Process Engineering.
- 2006, prof., Brno University of Technology, Design and Process Engineering.
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Career overview
- 1993-2002, assistant professor, Institute of Machine Design, Faculty of Mechanical Engineering, Brno University of Technology.
- 2003-2006, associate professor, Institute of Machine and Industrial Design, Faculty of Mechanical Engineering, Brno University of Technology.
- since 2003, director, Institute of Machine and Industrial Design, Faculty of Mechanical Engineering, Brno University of Technology.
- since 2006, professor, Institute of Machine and Industrial Design, Faculty of Mechanical Engineering, Brno University of Technology.
- Since 2010, Head of Division of Virtual Modeling and Testing, NETME Centre, Faculty of Mechanical Engineering, Brno University of Technology.
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Pedagogic activities
- Lectures in BSc study programme: Machine Design - Machine Elements, Machine Design - Mechanical Drives and Machine Design - Mechanisms.
- Lectures in MSc study programme: Tribology and Project of Diploma Thesis.
- Lectures in PhD study programme: Machines and Equipment - Methods and Organization of Scientific Work and Elastohydrodynamics.
- Supervision of BSc and MSc thesis from the field of tribology.
- Supervisor in PhD study programme Machines and Equipment.
- Head of team of translators and scientific editorial board (with doc. Ing. Miloš Vlk, CSc.) of Czech translation of the publication Shigley, Joseph E.; Mischke, Charles R.; Budynas, Richard G. Mechanical engineering design. 1st ed. Brno : Brno University of Technology, publisher VUTIUM, 2010. 1300 s. ISBN 978-80-214-2629-0.
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Scientific activities
- Main fields of scientific activities: optical methods for lubricant films study, elastohydrodynamic and mixed lubrication, very thin lubricant films, transient and non-steady state lubrication, lubricant rheology.
- Basic scientometrics indicators according to ISI Web of Knowledge: total number of articles 69, total number of citations 385, total number of citations excluding self-citations 234, average number of citation per article 5,71, h-index 10.
- Researcher ID: http://www.researcherid.com/rid/D-8261-2012.
- Profile at Google Scholar: http://scholar.google.cz/citations?user=iK-LNrgAAAAJ.
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Academic internships abroad
- 1999, Institut National des Sciences Appliquées de Lyon, Villeurbanne Cedex, France, visiting professor.
- 2000, Kyushu Institute of Technology, Kitakyushu, Japan, research visit.
- 2001, Tsinghua University, Beijing, China, research visit.
- 2003, Kyushu Institute of Technology, Kitakyushu, Japan, research visit.
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University activities
- since 2003, member of branch board of doctoral study programme Design and Process Engineering, Faculty of Mechanical Engineering, Brno University of Technology.
- 2010, member of scientific board, Faculty of Mechanical Engineering, Brno University of Technology.
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Non-University activities
- since 2011, member of evaluation panel of technical sciences of Czech Science Foundation.
- since 2013 member of editorial board of journal Friction (Springer, ISSN: 2223-7690).
- since 2013 member of editorial board of journal Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology (SAGE Publications, ISSN: 1350-6501).
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Industry cooperation
- Koyo Bearings Česká republika s.r.o.
- TRIBOTEC, spol. s r.o.
- ZKL - Výzkum a vývoj, a.s.
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Keywords
- Experimental research.
- Machine design.
- Tribology.
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Prizing by scientific community
- 1993, Talent92 - award from Minister of Education of the Czech republic for extraordinary results in field of research.
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Projects
- The Measurement and Study of Very Thin Lubricant Films on the Borderline between Elastohydrodynamic and Boundry Lubrication (Project GAČR 101/95/0330), 1995-1997
- The Study of Transient Elastohydrodynamic Lubrication by Computer Differential Colorimetry (Project GAČR 101/98/P226), 1998-2001
- The Study of Fatigue Failure of Elastohydrodynamically Lubricated Contacts Due to Debris Denting (Project GAČR 101/03/0525), 2003-2005
- Experimental Study of Lubrication Films Behaviour under Non-steady State Conditions (Project GAČR 101/05/0520), 2005-2007
- The Development of Machine Design Educational Laboratory on Faculty of Mechanical Engineering BUT (Project FRVŠ 2366), 2005
- The Establishment of CAD Education Centre (Project FRVŠ 675), 2006
- Thin film EHD lubrication study under non-steady state conditions (Project MŠMT ME08007), 2008-2010
- EHL nano/micro film behaviours under non-steady state conditions (Project GAČR GA101/09/J034), 2009-2011
- Study of lubrication film forming properties of newtonian and non-newtonian lubricants and their rheology (Project MŠMT ME09025), 2009-2012
- Complex System for Attracting, Education and Continuing Involment of Talented Individuals to Research Centers of AS CR and FME BUT (ECOP project CZ.1.07/2.3.00/09.0228), 2009-2012
- Research and development of adaptive wheel flange lubrication system (project MPO FR-TI3/442), 2011-2013
- Research and Development of performance optimized Rolling Bearings (project MPO FR-TI3/382), 2011-2013
- Effect of surface velocity directions on elastohydrodynamic film shape (project MŠMT LH12172), 2012-2014
- Research and development of progressive sanding rail vehicle system (project TAČR TA02030850), 2012-2014
- The influence of joint fluid composition on formation of lubricating film in THA (project MZO NT14267), 2013-2015
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Sum of citations (without self-citations) indexed within ISI Web of Knowledge
239
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Supervised courses:
Publications:
- NEČAS, D.; VRBKA, M.; URBAN, F.; GALLO, J.; KŘUPKA, I.; HARTL, M.:
In situ observation of lubricant film formation in THR considering real conformity: The effect of diameter, clearance and material, Elsevier Ltd.
journal article in Web of Science
- GALAS, R.; OMASTA, M.; KŘUPKA, I.; HARTL, M.:
Laboratory investigation of ability of oil-based friction modifiers to control adhesion at wheel-rail interface, Elsevier
journal article in Web of Science
- ŠPERKA, P.; KŘUPKA, I.; HARTL, M.:
Experimental Study of Roughness Effect in a Rolling–Sliding EHL Contact. Part I: Roughness Deformation, Taylor & Francis Inc
journal article in Web of Science
- ALI, F.; KŘUPKA, I.; HARTL, M.:
Mechanism for Controlling Oil Replenishment in Starved Elliptical EHL Contacts, Springer US
journal article in Web of Science
- KOŠŤÁL, D.; NEČAS, D.; ŠPERKA, P.; SVOBODA, P.; KŘUPKA, I.; HARTL, M.:
Lubricant Rupture Ratio at Elastohydrodynamically Lubricated Contact Outlet, Springer
journal article in Web of Science
- CHOUDHURY, D.; CHING, H.A.; MAMAT, A.B.; ČÍŽEK, J.; ABU OSMAN, N.A.; VRBKA, M.; HARTL, M.; KŘUPKA, I.:
Fabrication and characterization of DLC coated microdimples on hip prosthesis heads, Wiley Periodicals, Inc.
journal article in Web of Science
- ALI, F.; KŘUPKA, I.; HARTL, M.:
Effects of out-of-contact lubricant channeling on friction and film thickness in starved elastohydrodynamic lubrication point contacts, SAGE
journal article in Web of Science
- KUMAR, P.; BAIR, S.; KŘUPKA, I.; HARTL, M.:
Newtonian quantitative elastohydrodynamic film thickness with linear piezoviscosity,
Tribology International, Vol.43, (2010), No.11, pp.2159-2165, ISSN 0301-679X, Elsevier
journal article - other
List of publications at Portal BUT
- KŘUPKA, I.; HARTL, M.; BAIR, S.; KUMAR, P.; KHONSARI, M.M.:
An Experimental Validation of the Recently Discovered Scale Effect in Generalized Newtonian EHL,
Tribology Letters, Vol.33, (2008), No.X, pp.1-9, ISSN 1023-8883, Springer
journal article - other
New quantitative numerical simulations of the elastohydrodynamic lubrication (EHL) film forming ability of generalized Newtonian liquids have elucidated a
previously unrecognized property of EHL films. The dependency of the film thickness on the scale of the contact is greater when the viscosity is shear dependent within the inlet. Measurements of film thickness were performed in a ball on disc experiment using balls ranging from 5.5 to 35 mm in diameter. Three liquids were investigated with varying shear dependence in the range of stress important to film forming. The experimental results confirm the previous analytical findings. Numerical simulations using the measured viscosities show that the increased scale sensitivity is substantially the result of shear-thinning.
However, the smallest scales produced films thinner than even the shear-dependent prediction, possibly indicating molecular degradation. It is quite likely that some machine components, which were designed using the effective viscous properties derived from a larger scale film thickness measurement, are operating with substantially lower film thickness than the designer had intended.
- KŘUPKA, I.; HARTL, M.:
The effect of surface texturing on thin EHD lubrication films,
Tribology International, Vol.40, (2007), No.7, pp.1100-1110, ISSN 0301-679X, Elsevier
journal article - other
Surface texturing has been successfully used for conformal contacts in many tribological applications in an effort to diminish friction and wear. However, the use of such a surface modifications are still in nascent as far as highly loaded contacts between non-conformal surfaces are concerned. It is mainly caused by the fact that the presence of such micro-features within these contacts can significantly influence the pressure distribution within the contact. Nevertheless, it has been shown in recent studies that the surface texturing can also have beneficial tribological effects if the depth of micro-features is properly designed. This paper is devoted to the experimental study of the effect of the micro-dents of various depths on thin lubrication films to find an experimental evidence of the micro-feature depth threshold for surface texturing applications in highly loaded non-conformal surfaces. The behaviour of an array of micro-dents within thin EHD contacts has been studied by thin film colorimetric interferometry. The influence of surface texturing on lubricant film formation has been observed under sliding/rolling conditions. The significant effect of micro-dents depth on lubricant film thickness is observed for positive slide-to-roll ratio when the disc is moving faster than the micro-textured ball. The presence of deep micro-dents within lubricated contact results in film thickness reduction downstream. As the depth of micro-dents is reduced, this effect diminishes and beneficial effect of micro-dents on film thickness formation has been observed. No significant influence of micro-dents depth on lubricant film shape has been observed in case of negative slide-to-roll conditions when micro-dents do not cause film thickness reduction regardless of their depths.
- HARTL, M., FUIS, V., LIŠKA, M.:
Experimental study of lubricant film thickness behavior in the vicinity of real asperities passing through lubricated contact,
Tribology Transactions, Vol.47, (2004), No.3, pp.376-385, ISSN 0569-8197
journal article - other
This paper presents an experimental study of the influence of real surface micro-geometry on the film thickness in a circular elastohydrodynamic (EHD) contact formed between a real, random, rough surface of steel ball and smooth glass disc. The Phase Shifting Interferometry has been used to measure in situ initial undeformed rough surface profiles whereas Thin Film Colorimetric Interferometry has provided accurate information about micro EHD film thickness behavior over a wide range of rolling speed. Two real roughness features were studied in detail 56 nm high ridge and 90 nm deep groove, both transversely oriented to the direction of surface motion. It has been shown that ridge is heavily deformed in a loaded contact and its height increases with increasing rolling speed. The asperity tip film thickness behavior is quite similar to the contact average film thickness when the film thickness is higher than the undeformed ridge height. However below this limit the film is thicker than what the EHD theory predicts. For the groove, a local reduction in film thickness at the leading edge has been observed. When the groove is passing through the EHD conjunction, it maintains its undeformed shape. The behavior of both roughness features studied shows good agreement with previous experimental observations conducted using artificially-produced ridge and groove.
- LIU, Y., WANG, Q. J., WANG, W., HU, Y., ZHU, D., KŘUPKA, I., HARTL, M.:
EHL simulation using the free-volume viscosity model,
Tribology Letters, Vol.23, (2004), No.1, pp.27-37, ISSN 1023-8883, Springer Netherlands
journal article - other
The free-volume viscosity model can accurately predict the temperature pressure viscosity relationship of lubricants. However, it is seldom used in elastohydrodynamic lubrication (EHL) simulation. This paper presents the application of the free-volume viscosity model in a Newtonian EHL simulation of a squalane-lubricated circular contact. Good agreement is observed between available experimental data and simulation results. The pressure viscosity coefficients fit from viscometer data are also discussed. A recently developed definition of the coefficient is used to compare the coefficient value extracted from EHL film thickness interference measurements. Results indicate that the coefficient values from the curve fitting and EHL film thickness extraction agree well which has not been previously observed.
- HARTL, M., LIŠKA, M.:
Thin film colorimetric interferometry,
Tribology Transactions, Vol.44, (2001), No.2, pp.270-545, ISSN 0569-8197
journal article - other
Measurement technique for the study of very thin lubrication films down to one nanometer in a point contact between a steel hall and a transparent disc is used to explore the relationship between central and minimum film thickness and rolling speed at the interface between elastohydrodynamic and boundary lubrication for a series of lubricating fluids. This technique based on the colorimetric interferometry combines powerful film thickness mapping capabilities with high accuracy.
It was confirmed that both hexadecane and mineral base oil obey the linear relationship between log central and minimum film thickness and log rolling speed predicted by elastohydrodynamic theory down to approximately one nanometer. Conversely, squalane and additive-treated mineral base oil showed film thickness enhancement at slow speeds caused by boundary layers formation within the lubricant film. Obtained experimental data was used for the determination of pressure-viscosity coefficients of test fluids. The measurement technique also enabled us to produce information about the influence of boundary layers on film thickness shape.